Kougarok Deposit

Prospect in Alaska, United States with commodities Tin, Tantalum, Niobium (Columbium), Copper

Geologic information

Identification information

Deposit ID 10003257
MRDS ID A016079
Record type Site
Current site name Kougarok Deposit
Related records 10111933

Geographic coordinates

Geographic coordinates: -165.23647, 65.70293 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • ECON. GEO., V. 81, NO. 7, FIG. 2, P. 1778. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Tin Primary
Tantalum Secondary
Niobium (Columbium) Secondary
Copper Tertiary

Materials information

Materials Type of material
Cassiterite Ore
Chalcopyrite Ore
Axinite Gangue
Chlorite Gangue
Fluorite Gangue
Quartz Gangue
Topaz Gangue
Tourmaline Gangue

Alteration

  • (Local) Alteration Assemblages (In Order Of Increasing Intensity) Sericite-Tourmaline, Zinnwaldite-Sericite, Quartz-Tourmaline Greisen.

Analytical data

Result 0.1-15% SN, AVG. 0.5% SN
Result 0.01-0.05% TA
Result 0.01-0.05 NB
Result GSA ABSTRACTS WITH PROGRAMS, V. 17, NO. 7, P. 694.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -165.23647, 65.70293

Comments on the geologic information

  • ALTERATION INTENSITY (DEGREE OF DESTRUCTION OF IGNEOUS TEXTURE), SN GRADE AND TA-NB CONTENT INCREASE UPWARD IN ZINNWALDITE GRANITE BODY. GRANITIC INTRUSIVE COMPLEX CONSISTING OF (1) PORPHYRITIC BIOTITE GRANITE, (2) FINE GRAINED APLITIC GRANITE, (3) FELDSPAR-QUARTZ PORPHYRY, (4) EQUIGRANULAR GRANITE, AND (5) EQUIGRANULAR ZINNWALDITE GRANITE. ZINNWALDITE GRANITE INTRUDED INTO PELITIC SCHIST.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Significant No
Discovery year 1979
Discoverer Anaconda Minerals Co.

Mining district

District name Serpentine

Land status

Ownership category State

Ownership information

  • Type Owner
    Owner Anaconda Minerals Co. (Division Of Atlantic Richfield)
    First year 1986

Comments on the workings information

  • 9200 M OF DIAMOND DRILL HOLES, 1100 M OF BULLDOZER TRENCHING WERE COMPLETED BY 1983.

Comments on development

  • EXPLORATION ACTIVITY: 1979-1983, DRILLING TRENCHING, GRAVITY AND GEOCHEM. SURVEYS, GEOLOGIC MAPPING; ASSESSMENT WORK: 1986.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A016079

Bibliographic references

  • Deposit

    ECON. GEO., V. 81, NO. 7, P. 1775-1794.

  • Deposit

    GSA ABSTRACTS WITH PROGRAMS, V. 17, NO. 7, P. 694.

  • Deposit

    ADGGS SR 40, P. 38.

General comments

Subject category Comment text
Deposit CASSITERITE DISSEMINATED IN QUARTZ-TOURMALINE-TOPAZ-FLUORITE-GREISEN (1) ALONG THE ROOF ZONE OF LATE STAGE, SUBHORIZONTAL, SHEET-LIKE BODY OF ZINNWALDITE GRANITE, (2) IN AND AROUND TWO STEEPLY DIPPING CYLINDRICAL PIPES OF GREISENIZED GRANITE, (3) IN GREISENIZED DIKES, AND (4) STOCKWORK VEINLETS IN SCHIST; TANTALITE-COLUMBITE OCCURS AS DISSEMINATED GRAINS IN ZINNWALDITE GRANITE LATERAL TO SN-BEARING GREISEN IN ROOF ZONE; QUARTZ, QUARTZ-TOURMALINE, AND TOURMALINE STRINGERS IN SCHIST ABOVE GRANITIC INTRUSIVE COMPLEX CONTAIN CASSITERITE, PYRRHOTITE, ARSENOPYRITE, AND CHALCOPYRITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1987 Leonard, Kenneth R. (Huber, Donald F.) U.S. Geological Survey
Editor 20-SEP-1994 Mosier, Dan U.S. Geological Survey PARSED OUT HOST ROCK AND ASSOCIATED ROCK TYPES, AGES, UNIT NAMES, AND UNIT AGES.